While the emphasis on the external envelope has resulted in a standardisation of internal layouts that makes design into an eminently technical or exquisitely artistic fact, it is possible on the other hand to perceive an alternative course on the inside of Spanish architecture over the course of the twentieth century that starting with interiors, finds its own reason to exist.

From this point of view a propensity is shown, also thanks to the natural coexistence of premodern instances including Arab and Roman that led to a particular use of materials and the accentuation of the spatial component related to natural light.